<template>
    <!-- 底部 -->
    <div class="my-footer">
        <!-- 全选 -->
        <div class="custom-control custom-checkbox">
            <input type="checkbox" class="custom-control-input" id="footerCheck" @change="toggole" :checked="isall">
            <label class="custom-control-label" for="footerCheck">全选</label>
        </div>
        <!-- 合计 -->
        <div>
            <span>合计:</span>
            <span class="price">¥ {{heji}}</span>
        </div>
        <!-- 按钮 -->
        <button type="button" class="footer-btn btn btn-primary">结算 ({{jige}})</button>
    </div>
</template>

<script>
    export default {
        props: ['arr'],
        methods: {
            toggole(e) {
                this.arr.forEach(item => item.goods_state = e.target.checked)
            }
        },
        computed: {
            isall() {
                return this.arr.every(item => item.goods_state)
            },
            heji() {
                return this.arr.reduce((sum, obj) => {
                    if (obj.goods_state == true) {
                        sum += obj.goods_price * obj.goods_count
                    }

                    return sum
                }, 0)
            },
            jige() {
                return this.arr.filter(item => item.goods_state == true).length
            }
        }
    }
</script>

<style lang="less" scoped>
    .my-footer {
        position: fixed;
        z-index: 2;
        bottom: 0;
        width: 100%;
        height: 50px;
        border-top: 1px solid #ccc;
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0 10px;
        background: #fff;

        .price {
            color: red;
            font-weight: bold;
            font-size: 15px;
        }

        .footer-btn {
            min-width: 80px;
            height: 30px;
            line-height: 30px;
            border-radius: 25px;
            padding: 0;
        }
    }
</style>